C++ versions less than C++14 are not supported.

[WhaSukGO]

Steps

$ git clone
$ cd onnx-tensorrt
$ git submodule update --init --recursive
$ mkdir build
$ cmake .. -DTENSORRT_ROOT=/usr/src/tensorrt/ -DCMAKE_CXX_STANDARD=14
$ make -j$(nproc)

Error

In file included from /usr/local/include/absl/base/config.h:86,
                 from /usr/local/include/absl/base/attributes.h:37,
                 from /usr/local/include/absl/strings/string_view.h:39,
                 from /usr/local/include/google/protobuf/stubs/common.h:44,
                 from /usr/local/include/google/protobuf/io/coded_stream.h:130,
                 from /root/Development/onnx-tensorrt/build/third_party/onnx/onnx/onnx_onnx2trt_onnx-ml.pb.h:24,
                 from /root/Development/onnx-tensorrt/build/third_party/onnx/onnx/onnx_onnx2trt_onnx-ml.pb.cc:4:
/usr/local/include/absl/base/policy_checks.h:79:2: error: #error "C++ versions less than C++14 are not supported."
   79 | #error "C++ versions less than C++14 are not supported."
      |  ^~~~~

Environment

• TensorRT 23.04

root@1626b213f289:~/Development/onnx-tensorrt# gcc --version
gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

root@1626b213f289:~/Development/onnx-tensorrt# g++ --version
g++ (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

root@1626b213f289:~/Development/onnx-tensorrt# protoc --version
libprotoc 24.0

root@1626b213f289:~/Development/onnx-tensorrt# 

[WhaSukGO]

Here's a temporary solution,

$ apt install protobuf-compiler

[WhaSukGO]

So the problem is, a container built from TensorRT 23.04 already has CMake, but no protobuf. However, CMake has FindProtobuf.cmake

CMake Warning at /usr/local/share/cmake-3.24/Modules/FindProtobuf.cmake:524 (message):
  Protobuf compiler version doesn't match library version 4.24.0
Call Stack (most recent call first):
  CMakeLists.txt:64 (FIND_PACKAGE)

So I wanted to build new CMake, but it fails to detect newly installed CMake